Update .upptimerc.yml

Removed example sites

.upptimerc.yml

@@ -9,17 +9,6 @@ sites:
     url: https://minorplanetcenter.net/iau/NEO/toconfirm_tabular.html
   - name: Data Subdomain
     url: https://data.minorplanetcenter.net/
-  - name: Wikipedia
-    url: https://en.wikipedia.org
-  - name: Hacker News
-    url: https://news.ycombinator.com
-  - name: Test Broken Site
-    url: https://thissitedoesnotexist.koj.co
-  - name: IPv6 test
-    url: forwardemail.net
-    port: 80
-    check: "tcp-ping"
-    ipv6: true
 
 status-website:
   # Add your custom domain name, or remove the `cname` line if you don't have a domain